| US 7,514,896 B2 | ||
| Method of estimating magnetic pole position in synchronous motor | ||
| Akihiro Imura, Oobu (Japan); and Yasuaki Aoki, Kariya (Japan) | ||
| Assigned to Denso Corporation, Kariya (Japan) | ||
| Filed on Aug. 17, 2006, as Appl. No. 11/505,466. | ||
| Claims priority of application No. 2005-280410 (JP), filed on Sep. 27, 2005. | ||
| Prior Publication US 2007/0069681 A1, Mar. 29, 2007 | ||
| Int. Cl. H02P 1/46 (2006.01) | ||
| U.S. Cl. 318—718 [318/400.2; 318/700; 318/773] | 29 Claims |
| 1. A method of estimating a magnetic pole position in a synchronous motor, comprising the steps of:
calculating an induced voltage of the motor, to which an alternating current voltage is applied and from which an alternating
current is detected, from components of the applied alternating current voltage in a two-phase alternating current coordinates
system and components of the detected alternating current in the two-phase alternating current coordinates system; and
estimating a magnetic pole position in the motor from the induced voltage; and
controlling the motor according to the estimated magnetic pole position;
wherein the alternating current consists of waves having a wave height of which a differentiated value with respect to time
is substantially set at zero.
|